cmake_minimum_required(VERSION 3.1) ## ## PROJECT ## name and version ## project(nlohmann_json VERSION 3.9.0 LANGUAGES CXX) ## ## INCLUDE ## ## include(ExternalProject) ## ## OPTIONS ## if (POLICY CMP0077) # Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory. cmake_policy(SET CMP0077 NEW) endif () option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON) option(JSON_Install "Install CMake targets during install step." ON) option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF) option(JSON_ImplicitConversions "Enable implicit conversions." ON) ## ## CONFIGURATION ## include(GNUInstallDirs) set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME}) set(NLOHMANN_JSON_CONFIG_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "") set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}") set(NLOHMANN_JSON_TARGETS_EXPORT_NAME "${PROJECT_NAME}Targets") set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE "cmake/config.cmake.in") set(NLOHMANN_JSON_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_BINARY_DIR}") set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake") set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake") set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake") set(NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/pkgconfig") if (JSON_MultipleHeaders) set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/") message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}") else() set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/") message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}") endif() if (NOT JSON_ImplicitConversions) message(STATUS "Implicit conversions are disabled") endif() ## ## TARGET ## create target and add include path ## add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE) add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME}) if (${CMAKE_VERSION} VERSION_LESS "3.8.0") target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for) else() target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11) endif() target_compile_definitions( ${NLOHMANN_JSON_TARGET_NAME} INTERFACE JSON_USE_IMPLICIT_CONVERSIONS=$ ) target_include_directories( ${NLOHMANN_JSON_TARGET_NAME} INTERFACE $ $ ) ## add debug view definition file for msvc (natvis) if (MSVC) set(NLOHMANN_ADD_NATVIS TRUE) set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis") target_sources( ${NLOHMANN_JSON_TARGET_NAME} INTERFACE $ $ ) endif() # Install a pkg-config file, so other tools can find this. CONFIGURE_FILE( "${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in" "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc" ) ## ## TESTS ## create and configure the unit test target ## include(CTest) #adds option BUILD_TESTING (default ON) if(BUILD_TESTING AND JSON_BuildTests) enable_testing() add_subdirectory(test) endif() ## ## INSTALL ## install header files, generate and install cmake config files for find_package() ## include(CMakePackageConfigHelpers) # use a custom package version config file instead of # write_basic_package_version_file to ensure that it's architecture-independent # https://github.com/nlohmann/json/issues/1697 configure_file( "cmake/nlohmann_jsonConfigVersion.cmake.in" ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} @ONLY ) configure_file( ${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE} ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} @ONLY ) if(JSON_Install) install( DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR} DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR} ) install( FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR} ) if (NLOHMANN_ADD_NATVIS) install( FILES ${NLOHMANN_NATVIS_FILE} DESTINATION . ) endif() export( TARGETS ${NLOHMANN_JSON_TARGET_NAME} NAMESPACE ${PROJECT_NAME}:: FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE} ) install( TARGETS ${NLOHMANN_JSON_TARGET_NAME} EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME} INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR} ) install( EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME} NAMESPACE ${PROJECT_NAME}:: DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR} ) install( FILES "${CMAKE_BINARY_DIR}/${PROJECT_NAME}.pc" DESTINATION ${NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR} ) endif()